Apparatus for dilution of pulp

Abstract

A pulp diluting apparatus has a cylindrical vessel having the top portion thereof covered with a lid having a pulp inlet, a bearing mounted on the center of the lid, a lower steady support bearing mounted on the center of a bottom end portion of the cylindrical vessel, a rotary shaft held between the top bearing and the lower steady support bearing and provided on the lower portion thereof with rods having scraper plates, a water supply pipe disposed on the bottom end portion of the cylindrical vessel for supplying water into the cylindrical vessel, a valve provided on the water supply pipe for controlling the amount of water to be supplied into the water supply pipe, a driving machine connected to the rotary shaft for rotating the rotary shaft, a torque detector for detecting the torque of the driving machine and controlling the valve of the water supply pipe, and an outlet provided in the lower portion of the cylindrical vessel for taking the diluted pulp out of the cylindrical vessel.

What is claimed is: 
     
       1. In a pulp diluting apparatus having a cylindrical vessel, a lid having a pulp inlet therein covering the top of said vessel, a bottom end portion of said cylindrical vessel, an upper bearing mounted on the center of said lid, a lower steady support bearing mounted on the center of said bottom end portion of said cylindrical vessel, a rotary shaft rotatably mounted between said upper bearing and said lower bearing, rods having scraper blades mounted on the lower portion of said rotary shaft, a driving machine connected to said rotary shaft for rotating said shaft, and an outlet in the lower part of said cylindrical vessel beneath said rods for taking the diluted pulp out of said cylindrical vessel, the improvement comprising: water dischargers mounted on said rotary shaft in the center of said cylindrical vessel at a position above said rods and in positions spaced circumferentially around said rotary shaft and each having a water outlet disposed at a level above said rods and opening radially into the interior of said cylindrical vessel, and a first water supply pipe connected to said water dischargers;   a second water supply pipe disposed at the bottom portion of said cylindrical vessel proximate the center of said bottom end portion and opening generally upwardly into fluid communication with the interior of said cylindrical vessel at a position below said rods, means for supplying water to said second water supply pipe at a pressure at least sufficient for causing said second water supply pipe to discharge an ascending current of water sufficiently strong for pushing a mass of pulp contained within said cylindrical vessel upwardly;   a valve provided in said second water supply pipe;   a torque detector connected with said driving machine for detecting the torque of said driving machine and connected to said valve for operating said valve in response to an increase in torque detected to control the pressure of water supplied to said cylindrical vessel through said second water supply pipe to discharge an ascending current of water capable of pushing the lower portion of the mass of pulp upwardly at least to the position of said water outlets of said water dischargers.   
     
     
       2. The apparatus according to claim 1 wherein the improvement further comprises outlet for the diluted pulp being provided in the bottom end portion of said cylindrical vessel and being in contact with the side wall of said cylindrical vessel. 
     
     
       3. The apparatus according to claim 1 wherein the improvement further comprises scraper plates being swingably attached to said rods. 
     
     
       4. The apparatus according to claim 1 wherein the improvement further comprises said bottom end portion of said cylindrical vessel being inclined downwardly toward said outlet. 
     
     
       5. The apparatus according to claim 1 wherein the improvement further comprises a stirrer attached to said outlet. 
     
     
       6. The apparatus according to claim 1 wherein the improvement further comprises a second valve connected in said first water supply pipe and a timer connected to said second valve for controlling said second valve. 
     
     
       7. The apparatus according to claim 1 wherein the improvement further comprises said first water supply pipe being accommodated in said second water supply pipe. 
     
     
       8. The apparatus according to claim 1 wherein the improvement further comprises said lower steady support bearing having a passage therein and said first water supply pipe being connected to said water dischargers through said passage. 
     
     
       9. The apparatus according to claim 1 wherein the improvement further comprises water distribution pipes, each having a water outlet in the side wall of said cylindrical vessel, opening into the interior of said cylindrical vessel at a position above said rods. 
     
     
       10. The apparatus according to claim 9 wherein the improvement further comprises a second valve connected to said water distribution pipes and a timer connected to said second valve for controlling said second valve. 
     
     
       11. The apparatus according to claim 9 wherein the improvement further comprises said first water supply pipe being accommodated in said second water supply pipe. 
     
     
       12. The apparatus according to claim 9 wherein the improvement further comprises said lower steady support bearing having a pasage therein and said first water supply pipe being connected to said water dischargers through said passage. 
     
     
       13. The apparatus according to claim 1 wherein the improvement further comprises a float chamber on the lower portion of said rotary shaft and above said rods. 
     
     
       14. The apparatus according to claim 13 wherein the improvement further comprises said water dischargers being vertical dischargers disposed outside said float chamber and said water outlets projecting laterally therefrom into the interior of said cylindrical vessel. 
     
     
       15. The apparatus according to claim 14 wherein the improvement further comprises a second valve attached to said first water supply pipe and a timer connected to said second valve for controlling said second valve. 
     
     
       16. The apparatus according to claim 14 wherein the improvement further comprises said first water supply pipe being accommodated in said second water supply pipe. 
     
     
       17. The apparatus according to claim 14 wherein the improvement further comprises said lower steady bearing support having a passage therein and first water supply pipe being connected to said water dischargers through said passage.